Photocurrent response of topological insulator surface states

被引：74
作者：
Junck, Alexandra [1 ,2 ]
Refael, Gil [1 ,2 ,3 ]
von Oppen, Felix [1 ,2 ]
机构：
[1] Free Univ Berlin, Dahlem Ctr Complex Quantum Syst, D-14195 Berlin, Germany
[2] Free Univ Berlin, Fachbereich Phys, D-14195 Berlin, Germany
[3] CALTECH, Dept Phys, Pasadena, CA 91125 USA
来源：
PHYSICAL REVIEW B | 2013年 / 88卷 / 07期
基金：
美国国家科学基金会;
关键词：
SINGLE DIRAC CONE;
D O I：
10.1103/PhysRevB.88.075144
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We study the photocurrent response of topological insulator surface states to circularly polarized light for arbitrary oblique incidence. We describe the surface states within a Dirac model, including several perturbations such as hexagonal warping, nonlinear corrections to the mode velocity, and applied magnetic fields. We find that the photogalvanic current is strongly suppressed for the usual orbital coupling, prompting us to include the weaker Zeeman coupling. We find that the helicity-independent photocurrent dominates over the helicity-dependent contributions.
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页数：7
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